Cubic system boron nitride sintered body for a cutting tool
AssigneesDenki Kagaku Kogyo Kabushiki Kaisha, Mitsubishi Materials Corporation
InventorsMasaharu Suzuki, Teruyoshi Tanase
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Abstract
A cubic system boron nitride sintered body for a cutting tool, which is a cubic system boron nitride sintered body having a purity of at least 99 wt % obtained by a direct conversion method, wherein the average size of primary crystal grains constructing the sintered body is at most 3.0 .mu.m.
Claims13
A sintered body, comprising a cubic system boron nitride sintered body having a purity of at least 99 wt % prepared by a direct conversion method, wherein the average size of primary crystal grains constructing the sintered body is 0.1 .mu.m to 3.0 .mu.m,
- said purity is the purity determined by X-ray diffraction, and chemical analyses or fluorescence X-ray analyses, and
- a chip blank cut from said sintered body has a wear width of at most 0.205 mm without chipping, cracking or breaking, after a cutting test using FC25 cast iron, TNGN332 chip shape, a cutting speed of 700 m/min, a feeding of 0.1 mm/rev, a cutting depth of 0.1 mm and a cutting time of 60 min.
A cutting tool comprising:
- a holder, and
- a cubic system boron nitride sintered body;
- wherein said cubic system boron nitride sintered body has a purity of at least 99 wt % obtained by a direct conversion method, wherein the average size of primary crystal grains constructing the sintered body is 0.1 .mu.m to 3.0 .mu.m, and
- wherein said purity is the purity determined by X-ray diffraction, and chemical analyses or fluorescence X-ray analysis, and
- a chip cut from said sintered body has a wear width of at most 0.205 mm without chipping, cracking or breaking, after a cutting test using FC25 cast iron, TNGN332 chip shape, a cutting speed of 700 m/min, a feed of 0.1 mm/rev, a cutting depth of 0.1 mm and a cutting time of 60 min.
Dependencies are inferred from the claim text.